• The Journal of Advanced Prosthodontics
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• 제6권6호
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• pp.462-467
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• 2014

PURPOSE. This study investigated the influence of surface conditioning procedures and repeated firings on monoclinic content and strength of zirconia before cementation. MATERIALS AND METHODS. Sintered bar-shaped zirconia specimens were subjected to no surface treatment (control), air abrasion, or grinding (n=21). Their roughness was evaluated using a profilometer, and microscope analysis was performed on one specimen of each group. Then, 2 or 10 repeated firings (n=10) were executed, the monoclinic content of specimens was analyzed by X-ray diffraction, and a three-point flexural strength test was performed. Surface roughness values were compared using one-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) tests, the monoclinic content values were tested using Kruskal-Wallis and Mann-Whitney U tests, and the flexural strength values were tested using two-way ANOVA and Tukey HSD tests (P=.05). Spearman's correlation test was performed to define relationships among measured parameters. RESULTS. Surface-treated specimens were rougher than untreated specimens and had a higher monoclinic content (P<.005), and the relationship between roughness and monoclinic content was significant (P<.000). Neither surface treatment nor firing significantly affected the flexural strength, but Weibull analysis showed that for the air-abraded samples the characteristic strength was significantly lower after the $10^{th}$ firing than after the $2^{nd}$ firing. CONCLUSION. After firing, a negligible amount of monoclinic content remained on the zirconia surfaces, and rougher surfaces had higher monoclinic contents than untreated surfaces. Multiple firings could be performed if necessary, but the fracture probability could increase after multiple firings for rougher surfaces.

• 한방재활의학과학회지
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• 제29권1호
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• pp.7-20
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• 2019

Objectives The purpose of this study was to improve the comfort of daily life such as reduction of headache and increase of movement of neck by using muscle relaxation approach and joint movement approach for office worker with tension type headache of foward head posture sitting over 5 hours. Methods For this, 9 male and 15 female participated in the foward head posture with tension type headache. Each group consisted of 3 male and 5 female. Groups are divided into groups, such as muscle relaxation therapy, joint movement therapy, muscle relaxation and joint movement therapy. After intervention for each group for a month, we measured neck movement and head disability index and neck disability index 2 week. SPSS 23.0 (IBM Corp., Armonk, NY, USA) was used for data analysis. The one-way repeated analysis of variance (ANOVA), one-way ANOVA, compared t-test was used for statistical analysis. Results Three intervention groups have brought improvements in neck movement and daily life comfort. There is significant difference in the improvement of neck extension and change in neck disability index between 2 and 4 weeks in the joint movement approach compared to muscle relaxation approach, muscle relaxation and joint movement approach. Conclusions Office workers are exposed to tension type headache. However, muscle relaxation approach and joint movement approach can improve neck movement and daily life comfort.

• 아동학회지
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• 제12권2호
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• pp.94-110
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• 1991

This study examined the developmental aspects of sex role stereotypes among children and the impact of stereotypic and reversed stereotypic sex role content on children's sex-stereotypic thinking. In study I, subjects were 181 Korean children ranging from nursery and kindergarten to grade 1. SERLI was used to measure children's sex role stereotypes. In study II, the subjects were 62 six-year-old kindergarten children of each sex. 4 experimental stories were developed haled on Hong(1991). A test-retest design was used to study sex role stereotypes and the impact of stereotypic and reversed-stereotypic sex role content. Statistical analysis of obtained data was by an ANOVA and two-way analysis of co-variance. Results revealed that 6-year-old children's sex role stereotypes were higher than 5-and 7-year-old children. Boys were higher than girls on children's sex role stereotypes. Children exposed to reversed sex role content changed significantly in the direction of reversed stereotyping.

• Restorative Dentistry and Endodontics
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• 제45권4호
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• pp.47.1-47.11
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• 2020

Objectives: The aim of this study was to assess the physicochemical properties, cytotoxicity and penetration into dentinal tubules of ChlorCid^TM Surf (3% sodium hypochlorite [NaOCl] with surfactant) in comparison to ChlorCid^TM (3% NaOCl without surfactant). Materials and Methods: The physicochemical properties evaluated were pH, surface tension, free available chlorine (FAC) and contact angle. Cytotoxicity was evaluated in L929 fibroblasts exposed to the solutions by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide and neutral red assays. Assessment of penetration into dentinal tubules was performed by staining single-rooted permanent human teeth with crystal violet (n = 9), which were irrigated with the solutions and analyzed in cervical, middle and apical segments. Data were analyzed by one-way analysis of variance (ANOVA) and Tukey's post-test, 2-way ANOVA and Bonferroni's post-test or t-test (α = 0.05). Results: ChlorCid^TM Surf and ChlorCid^TM FAC values were close to those indicated by the manufacturer. ChlorCid^TM Surf showed lower surface tension and contact angle on dentin, and higher pH than ChlorCid^TM (p < 0.05). The penetration of ChlorCid^TM Surf was higher in cervical and middle segments, compared with ChlorCid^TM (p < 0.05). There was no difference in irrigant cytotoxicity (p > 0.05). Conclusions: ChlorCid^TM Surf showed lower surface tension, lower contact angle on root canal dentin, higher penetration into dentinal tubules and more alkaline pH, compared with ChlorCid^TM. However, both solutions showed similar cytotoxicity and FAC content.

• 가정과삶의질연구
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• 제9권1호통권17호
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• pp.13-26
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• 1991

The purpose of the study is to examine the realities of the high school students's aggressive behavior, and to analyze factors causing aggressive behavior. Subjects were 418 Humanity High School students of 2nd grades in pusan. Analysis methods were used to frequency, percentage, t-test, one way ANOVA, Pearson's correlation, and multiple regression of SPSS program. The results are as follows ; 1) Male students are more aggressive than female students. 2) The more verbal aggression is the more physical aggression. 3) Students with the experience of parent-child violence are more aggressive. 4) Students with observation of parents's violence are more aggressive. 5) Family's social economic status is not related to the aggressive behavior. 6) Male students not admitted by teacher are more aggressive in verbal and physical behavior. 7) Female students not admitted by friend are more aggressive in verbal and physical behavior. 8) Students with deliquent friends are more aggressive in verbal and physical behavior. 9) Students with Academic anxiety are more aggressive in verbal behavior. 10) the variables influential to verbal aggressive behavior are sex, a delinquent friends and academic anaxiety. These factors explain 23.5% of the total variance of verbal aggressive behavior variables. The variables influential to physical aggressive behavior are a delinquent friends, sex, experience of parent-child violence and teacher's denial attitude. These factors explain 29.6% of the total variance for physical aggressive behavior variables.

• 자원환경지질
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• 제35권6호
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• pp.545-552
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• 2002

광주과학기술원 에너지환경연구센터에서는 2000년 한해 동안 원자력발전소 주변 환경방사선 조사계획에 의거하여 영광원자력발전소 부지외부 및 비교지점에서 토양, 하천토 및 해저토 등 환경방사능 시료에 대한 감마선 방출핵종 분석을 수행하였다. 분석결과 토양과 하천토 및 해저토에서 인공핵종인 Cs-137이 검출되었으나 지난 3년간(1997-99)의 측정치인 평상범위 이내의 값이었고, 원전과 관계없는 일반지역에서 검출되는 수준과도 동일하며, 반감기가 짧은 Cs-134는 전혀 검출되지 않은 것으로 보아 원전가동에 의한 영향이 아님을 알 수 있다. 환경시료 측정에 대한 품질관리를 위해 임의로 선정된 가마미인근에서 해저토 시료를 각각 5지점에서 중복시료로 채취하석 상대 검출효율이 각각 30%, 45%인 2대의 HPGe Gamma-ray Spectroscope로 동시에 분석하여 환경방사선 측정자료와 분석의 신뢰도를 향상시키기 위한 지구통계학적인 연구를 수행하였다. 이를 위해서 두 가지 요인을 설정하여 시료분석방법과 채취지점의 차이를 이원배치 분산분석을 수행하였다. Two-way ANOVA 결과 Cs-137 및 K-40의 경우 시료채취 지점의 차이에 의한 분산만이 유효하며, 시료채취 및 분석과정에서의 생기는 오차는 무시할 만하여 지금까지 수행되어진 시료채취 및 분석방법은 신뢰할 만하다고 할 수 있었다.

• 한국콘텐츠학회논문지
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• 제13권11호
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• pp.726-739
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• 2013

다가올 고령사회 고령자의 사회문제를 해결하기 위한 방안으로 사회적 건강의 필요성을 주장하고, 고령자의 사회적 건강이 삶의 질에 미치는 영향을 파악하고자 함이 주된 연구의 목적이다. 이를 위해 경기도 의왕시에 거주하고 있는 65세 이상 고령자 중 사회활동에 참가하는 고령자를 대상으로 하였으며, 총 157부가 최종분석에 사용되었다. IBM SPSS 21.0 을 이용하여 빈도분석, t-Test와 one-way ANOVA, Duncan 사후검정상관관계분석, 위계적 회귀분석을 실시하였다. 주된 연구결과는 다음과 같다. 사회인구학적 요인과 사회적 건강의 상관관계에 있어서는 경제적수준, 주관적 건강과 사회적 건강은 양(+)적인 상관관계를 나타냈으며, 요양등급은, 경제적수준, 주관적 건강은 사회적 건강과는 음(-)적인 상관관계를 나타냈다. 사회적 건강이 삶의 질에 미치는 영향에 있어서는 사회인구학적 특성 변인만을 투입한 모델1의 경우 분산설명력은 38.2%로 나타났고, 회귀모형은 유의미하였다(F=13.141, p<.001). 사회인구학적 특성과 사회적 건강 변인을 투입한 모델2의 경우 분산설명력은 13.8%로 나타났으며, 회귀모형은 유의미하였다(F=20.057, p<.001). 이상의 연구결과를 바탕으로 몇 가지 제언을 제시하였다.

• 한국생활과학회지
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• 제7권1호
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• pp.25-38
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• 1998

The purpose of this study was to examine developmental trends in script-based organization strategy and relative influences of age, use of organizational strategy and category typicality of lists on children's recall. The subjects were 120 infant children, -40 four years old, 40 five years old, 40 six years old. All subjects were received 1 of 2 slot-filler lists of items differing in category representativness. Data were analysed by two-way Anova, Duncan's post-hoc test and Multiple Regression analysis. The major findings were as follows. 1. Recall and use of organizational strategy were increased with age. 2. At each age level, children showed high level of recall and organization strategy for category typical than category atypical. 3. Children's age, use of organizational strategy and category typicality of list significantly predicted children's recall. 42% of the variance of children's recall was explained by three variables. The relative influence of age to the prediction of children's recall was the strongest.

• Restorative Dentistry and Endodontics
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• 제39권1호
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• pp.17-23
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• 2014

Objectives: This study evaluated the efficacy of Endosolv-R and Xylene in softening epoxy resin based sealer after 1 to 2 min exposure. Materials and Methods: Sixty Teflon molds ($6mm{\times}1.5mm$ in inner diameter and depth) were equally divided into 3 groups of 20 each. AH 26 (Dentsply/De Trey), AH Plus (Dentsply/De Trey), Adseal (Meta-Biomed) were manipulated and placed in the molds allotted to each group and allowed to set at $37^{\circ}C$ in 100% humidity for 2 wk. Each group was further divided into 2 subgroups according to the solvents used, i.e. Xylene (Lobachemie) and Endosolv-R (Septodont). Specimens in each subgroup were exposed to respective solvents for 1 and 2 min and the corresponding Vicker's microhardness (HV) was assessed. Data was analysed by Mauchly's test and two-way analysis of variance (ANOVA) with repeated measures, and one-way ANOVA. Results: Initial hardness was significantly different among the three sealers with AH Plus having the greatest and Adseal having the least. After 2 min, Xylene softened AH Plus and Adseal sealer to 11% and 25% of their initial microhardness, respectively (p < 0.001), whereas AH 26 was least affected, maintaining 89.4% of its initial microhardness. After 2 min, Endosolv-R softened AH 26, AH Plus and Adseal to 12.7, 5.6 and 8.1% of their initial microhardness, respectively (p < 0.001). Conclusions: Endosolv-R was a significantly more effective short term softener for all the tested sealers after 2 min whereas Xylene was an effective short term softener against AH plus and Adseal but less effective against AH 26.

• 디지털융복합연구
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• 제13권2호
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• pp.267-277
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• 2015

본 연구의 목적은 중년기 남성 만성 간 질환자의 삶의 질에 대한 관련요인을 알아보고자 시도되었다. 연구 방법은 병원에서 외래치료를 받는 110명의 환자를 대상으로 설문조사와 전자의무기록지를 활용하였다. 자료분석은 PASW (SPSS) 19.0 프로그램을 이용하여, one-way ANOVA, Pearson 상관관계와 다중회귀분석하였다. 연구결과는 중년기 남성 만성 간 질환자의 삶의 질은 48.16점/100점이었으며, 불안과 우울, 증상경험, 건강지각, 질병상태와 배우자가 있는 경우에서 유의하게 나타났으며, 이들 요인은 삶의 질을 68.6% 설명하였다. 결론은 중년기 남성 만성 간 질환자의 삶의 질은 불안과 우울의 정서적 요인이 주요 요인이므로, 불안과 우울을 감소시킬 수 있는 간호중재전략의 개발을 제안한다.